Python exposure.equalize_adapthist函数代码示例

def test_adapthist_grayscale():
    """Test a grayscale float image
    """
    img = skimage.img_as_float(data.astronaut())
    img = rgb2gray(img)
    img = np.dstack((img, img, img))
    with expected_warnings(['precision loss|non-contiguous input', 
                            'deprecated']):
        adapted_old = exposure.equalize_adapthist(img, 10, 9, clip_limit=0.01,
                                                  nbins=128)
        adapted = exposure.equalize_adapthist(img, kernel_size=(57, 51), clip_limit=0.01, nbins=128)
    assert img.shape == adapted.shape
    assert_almost_equal(peak_snr(img, adapted),  102.078, 3)
    assert_almost_equal(norm_brightness_err(img, adapted), 0.0529, 3)
    return data, adapted

def get_data(mypath):
	t0 = time.time()
	print mypath
	n = 100000
	data = []
	paths = []
	for i in range(n):

	    if i % 100 == 0:
		if i > 0:
			elapsed = time.time() - t0
			left = n-i
			rate = i/elapsed
			ETA = left/rate
			print "ETA: {0}min".format(int(ETA/60))
	    path = join(mypath, str(i))+'.fits'
	    if not os.path.exists(path): continue
	    #this line reads the data
	    img = pyfits.getdata(path,0,memmap=False)           
	    #this line take the absolute value (negative noise)
        img_adapteq = np.abs(img)
        #this is the preprocessing algorithm, comment this out to remove the preprocessing of the image completely
        img_adapteq = exposure.equalize_adapthist(np.log(img_adapteq + 1.0), clip_limit=0.5,kernel_size=(4,4))

        #saving the paths is useful to restore which array belonged to which image on the harddrive
	    paths.append(path)
	    #add data to list
	    data.append(img_adapteq)

def pre_process(y_dict, train_directories, images, output_shape, adaptive_histogram, jobid, arraysize, clip_limit=0.03):
	
	# Store preprocessed images
	X = []
	y = []

	
	for train_directory in train_directories:
		# Get valid training images
		filenames = []
		for filename in os.listdir(train_directory):
			if filename.endswith(".jpeg") and filename.split('.')[0] in images:
				filenames.append(filename)

		start = len(filenames)/arraysize*jobid
		end = len(filenames)/arraysize*(jobid+1)
		if jobid+1 == arraysize:
			end = len(filenames)

		# preprocess each image
		for filename in filenames[start:end]:
			im = io.imread(train_directory + "/" + filename)
			im = rgb2gray(im)
			im = resize(im, output_shape) 
			if adaptive_histogram:
				im = exposure.equalize_adapthist(im, clip_limit=clip_limit)
			X.append(im.flatten())
			y.append(y_dict[filename.split(".jpeg")[0]])
				
	return X, y

def find_blobs(filename):
    feature = ""
    raw_image = io.imread(filename)
    for channel in range(0, 4):
        if channel < 3:
            image = raw_image[:,:,channel]
        image_gray = rgb2gray(image)

        # Smoothing
        image_gray = img_as_ubyte(image_gray)
        image_gray = mean_bilateral(image_gray.astype(numpy.uint16), disk(20), s0=10, s1=10)

        # Increase contrast
        image_gray = exposure.equalize_adapthist(image_gray, clip_limit=0.03)

        # Find blobs
        blobs_doh = blob_doh(image_gray, min_sigma=1, max_sigma=20, threshold=.005)
        count = 0
        for blob in blobs_doh:
            y, x, r = blob
            if (x-400)**2 + (y-400)**2 > distance:
                continue
            count = count + 1
        feature = feature + " " + str(channel + 1) + ":" + str(count)
    return feature

def equalize_hist_adapt(img=None, window_shape=(10, 10), nbins=256):
    '''
    Contrast Limited Adaptive Histogram Equalization (CLAHE).
    Increases local contrast.

    Parameters
    ----------
    img : array_like
        Single image as numpy array or multiple images as array-like object
    window_shape : tuple of integers
        Specifies the shape of the window as follows (dx, dy)
    nbins : integer
        Number of bins to calculate histogram

    References
    ----------
    .. [1] http://scikit-image.org/docs/dev/auto_examples/color_exposure/plot_local_equalize.html # noqa
    .. [2] https://en.wikipedia.org/wiki/Histogram_equalization

    '''
    minimum = img.min()
    maximum = img.max()
    img = rescale_intensity(img, 0, 1)
    img = exposure.equalize_adapthist(img, kernel_size=window_shape,
                                      nbins=nbins)
    img_out = rescale_intensity(img, minimum, maximum)
    return img_out

def Image_ws_tranche(image):
    
    laser = Detect_laser(image)
    laser_tranche = tranche_image(laser,60)
    
    image_g = skimage.color.rgb2gray(image)
    image_g = image_g * laser_tranche
    
    image_med = rank2.median((image_g*255).astype('uint8'),disk(8))
    
    image_clahe = exposure.equalize_adapthist(image_med, clip_limit=0.03)
    image_clahe_stretch = exposure.rescale_intensity(image_clahe, out_range=(0, 256))

    image_grad = rank2.gradient(image_clahe_stretch,disk(3))
    
    image_grad_mark = image_grad<20
    image_grad_forws = rank2.gradient(image_clahe_stretch,disk(1))
    
    image_grad_mark_closed = closing(image_grad_mark,disk(1))
    
    Labelised = (skimage.measure.label(image_grad_mark_closed,8,0))+1
    Watersheded  = watershed(image_grad_forws,Labelised)
    
    cooc = coocurence_liste(Watersheded,laser,3)
    
    x,y = compte_occurences(cooc)
    
    return x,y

def returnProcessedImage(que,folder,img_flist):
	X = []
	for fname in img_flist:
		cur_img = imread(folder+'/'+fname , as_grey=True)
		cur_img = 1 - cur_img

		######## randomly add samples

		# random add contrast
		r_for_eq = random()
		cur_img = equalize_adapthist(cur_img,ntiles_x=8,ntiles_y=8,clip_limit=(r_for_eq+0.5)/3)

		
		#random morphological operation
		r_for_mf_1 = random()
		if 0.05 < r_for_mf_1 < 0.25: # small vessel
			selem1 = disk(0.5+r_for_mf_1)
			cur_img = dilation(cur_img,selem1)
			cur_img = erosion(cur_img,selem1)
		elif 0.25 < r_for_mf_1 < 0.5: # large vessel
			selem2 = disk(2.5+r_for_mf_1*3)
			cur_img = dilation(cur_img,selem2)
			cur_img = erosion(cur_img,selem2)
		elif 0.5 < r_for_mf_1 < 0.75: # exudate
			selem1 = disk(9.21)
			selem2 = disk(7.21)
			dilated1 = dilation(cur_img, selem1)
			dilated2 = dilation(cur_img, selem2)
			cur_img = np.subtract(dilated1, dilated2)
		
		cur_img = img_as_float(cur_img)
		X.append([cur_img.tolist()])
	# X = np.array(X , dtype = theano.config.floatX)
	que.put(X)
	return X

        def set_roi_images(self):
            for i,rois_ in enumerate(self.roi_sets):
                temp_im = rois_[0]['patches'][self.roi_idx][self._show_im[i]]
                temp_im /= np.max(temp_im)
                im_to_set = exposure.equalize_adapthist(temp_im,
                                                        clip_limit=.005)
                #im_to_set *= (im_to_set+sobel(im_to_set))
                #im_to_set = temp_im
                self.imgs[i].setImage(im_to_set,autolevels=1)
                #if  'centroid_patches' in rois_[0].keys():
                #    self.centroid_patches[i].setImage(rois_[0]['centroid_patches'][self.roi_idx],autolevels=1)
                m_ = rois_[0]['masks'][self.roi_idx]
                #print np.mean(np.array(np.where(m_)),axis=1)
                #print m_.shape==(100,100)
                #print np.all([iii.shape==(100,100) for iii in rois_[0]['masks']]), i
                m2_ = np.dstack([m_,np.zeros(m_.shape),np.zeros(m_.shape),m_])
                self.masks[i].setImage(m2_)
                self.masks[i].setOpacity(.2)
                if rois_[0]['isPresent'][self.roi_idx]==0:
                    fr = self.redframe
                else:
                    fr = self.greenframe
                self.frames[i].setImage(fr)
                if rois_[0]['drawn_onday'][self.roi_idx]:
                    self.drawnTexts[i].setText('Drawn On Day',color=[0,0,250])
                else:
                    self.drawnTexts[i].setText('Copied',color=[250,0,0])

                self.confTxts[i].setText(self.confidence_labels[(rois_[0]['confidence'][self.roi_idx])])

def extract_patches(path, numPatchesPerImage, patchSize):

    """
    :param path: path to a RGB fundus image
    :param numPatchesPerImage: number of patches to extract per image
    :param patchSize: patch is nxn size
    :return: patches: matrix with an image patch in each row
    """

    img = load(path)
    img = img[:,:,1]
    #contrast enhancemenet
    img = equalize_adapthist(img)
    windows = view_as_windows(img, (patchSize,patchSize))
    j = 0
    patches = np.zeros((numPatchesPerImage, patchSize*patchSize))
    while(j < numPatchesPerImage):
        
        sx = np.random.randint(0, windows.shape[0] - 1)  
        sy = np.random.randint(0, windows.shape[0] - 1)
        x = (patchSize/2 - 1) + sx
        y = (patchSize/2 - 1) + sy
        r = (img.shape[0]/2) - 1

        if np.sqrt((x - r) ** 2 + (y - r) **2 ) < r:
            patch = windows[sx, sy, :].flatten()            
            patches[j,:] = patch
            j += 1 
        else:
            if j > 0:
                j -= 1 
    
    return patches

def imagefile2dat(imageFilename, rotate = False, overwrite = False):
    """Load an image file and save in format to be read by C code"""

    global m
    global n
    global fringeDatFilename
    global wrappedDatFilename

    # read image file
    orig = io.imread(imageFilename, as_grey=True)

    img = exposure.equalize_adapthist(orig)
    img = exposure.rescale_intensity(img,out_range=(0, 255))
    if rotate:
        img = np.transpose(img)

    n = len(img) 
    m = len(img[0])

    fileroot, ext = os.path.splitext(imageFilename)
    fringeDatFilename = fileroot+'.dat'
    wrappedDatFilename = fileroot+'W.dat'
    
    if os.path.isfile(fringeDatFilename) == False or overwrite == True:
        print 'Writing '+fringeDatFilename
        # write in proper binary format
        data = np.reshape( np.transpose(img), (n*m,1))
        newFile = open (fringeDatFilename, "wb")
        newFile.write(pack(str(n*m)+'B', *data))
        newFile.close()
    else:
        print 'Skipped overwriting '+fringeDatFilename

    return img

def enhance(in_file, clip_limit=0.010, in_mask=None, out_file=None):
    import numpy as np
    import nibabel as nb
    import os.path as op
    from skimage import exposure, img_as_int

    if out_file is None:
        fname, fext = op.splitext(op.basename(in_file))
        if fext == '.gz':
            fname, _ = op.splitext(fname)
        out_file = op.abspath('./%s_enh.nii.gz' % fname)

    im = nb.load(in_file)
    imdata = im.get_data()
    imshape = im.get_shape()

    if in_mask is not None:
        msk = nb.load(in_mask).get_data()
        msk[msk > 0] = 1
        msk[msk < 1] = 0
        imdata = imdata * msk

    immin = imdata.min()
    imdata = (imdata - immin).astype(np.uint16)

    adapted = exposure.equalize_adapthist(imdata.reshape(imshape[0], -1),
                                          clip_limit=clip_limit)

    nb.Nifti1Image(adapted.reshape(imshape), im.get_affine(),
                   im.get_header()).to_filename(out_file)

    return out_file

def main(image):

    matplotlib.rcParams["font.size"] = 10

    def show_img(img, axes):
        """Plot the image as float"""
        # img = img_as_float(img)
        ax_img = axes
        ax_img.imshow(img, cmap=plt.cm.gray)
        ax_img.set_axis_off()

        return ax_img

    # Open and read in the fits image
    try:
        fits = pyfits.open(image)
        # fits = Image.open(image)
    except IOError:
        print "Can not read the fits image: " + image + " !!"

    # Check the input image
    img = fits[0].data
    # img = np.array(fits)
    if img.ndim != 2:
        raise NameError("Data need to be 2-D image !")

    # Logrithm scaling of the image
    img_log = np.log10(img)
    img_log = img_as_float(img_log)

    # Contrast streching
    p5, p95 = np.percentile(img, (2, 98))
    img_rescale = exposure.rescale_intensity(img, in_range=(p5, p95))

    # Adaptive equalization
    img_new = bytescale(img_rescale)
    img_ahe = exposure.equalize_adapthist(img_new, ntiles_x=16, ntiles_y=16, clip_limit=0.05, nbins=256)
    img_ahe = img_as_float(img_ahe)

    # Display results
    fig, axes = plt.subplots(nrows=1, ncols=3, figsize=(16, 5))

    # Original image
    ax_img = show_img(img_log, axes[0])
    ax_img.set_title("Original")

    # Contrast Enhanced one
    ax_img = show_img(img_rescale, axes[1])
    ax_img.set_title("Rescale")

    # AHE Enhanced one
    ax_img = show_img(img_ahe, axes[2])
    ax_img.set_title("AHE")

    # Prevent overlap of y-axis
    fig.subplots_adjust(bottom=0.1, right=0.9, top=0.9, left=0.1, wspace=0.05)

    # Save a PNG file
    plt.gcf().savefig("ahe_test.png")

def equalize_adaptive(image, n_tiles=8, clip_limit=0.01):
    
    eqproj = equalize_adapthist(image,
                                ntiles_x=n_tiles, 
                                ntiles_y=n_tiles,
                                clip_limit=clip_limit)

    return eqproj

    def analyse(self, **kwargs):
        image_object = kwargs['image']

        if image_object is None:
            raise RuntimeError()

        # Read the image
        image = cv2.imread(self.image_utils.getOutputFilename(image_object.id))

        if image is None:
            print('File not found')
            return

        # Work on green channel
        gray = image[:, :, 1]

        # Apply otsu thresholding
        thresh = filters.threshold_otsu(gray)
        gray[gray < thresh] = 0

        # Apply histogram equalization
        gray = exposure.equalize_adapthist(gray) * 255

        # Create elevation map
        elevation_map = filters.sobel(gray)

        gray = gray.astype(int)

        # Create cell markers
        markers = numpy.zeros_like(gray)
        markers[gray < 100] = 2  # seen as white in plot
        markers[gray > 150] = 1  # seen as black in plot

        # Segment with watershed using elevation map
        segmentation = morphology.watershed(elevation_map, markers)
        segmentation = ndi.binary_fill_holes(segmentation - 1)
        # labeled_image, n = ndi.label(segmentation)

        # Watershed with distance transform
        kernel = numpy.ones((5, 5), numpy.uint8)

        distance = ndi.distance_transform_edt(segmentation)
        distance2 = cv2.erode(distance, kernel)
        distance2 = cv2.dilate(distance2, kernel)
        local_max = peak_local_max(distance2, num_peaks=1, indices=False, labels=segmentation)
        markers2 = ndi.label(local_max)[0]
        labels = morphology.watershed(-distance2, markers2, mask=segmentation)

        # Extract regions (caching signifies more memory use)
        regions = regionprops(labels, cache=True)

        # Filter out big wrong regions
        regions = [region for region in regions if region.area < 2000]

        # Set result
        result = str(len(regions))

        return result

 def segment(self, image):
     img = equalize_adapthist(image)
     (x,y,c) = img.shape
     points = img.reshape(x * y, c)
     labels = self.logreg.predict(points)
     labeled_img = labels.reshape(x, y)
     (top, right, bottom, left) = self.get_bounding_rect(labeled_img)
     # return img[left-self.margin:right+self.margin,top-self.margin:bottom+self.margin]
     return img[left:right,top:bottom]